i just found out this is legal!!! crazy isn't it!!!

There is a car seat exemption in Victoria for taxis, whilst it may not seem right, it is allowed. This is from the Vic Roads site:

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Twice I have used a taxi without a restraint when Maggie was little, but I did have her in the HAB, so she was restrained by that, I just made sure the my seat belt was not across her. If it was something I had to do regularly, then I would bring my own car seat with me or organise a VHA taxi with a seat.